Ink-jet printer

ABSTRACT

An ink-jet printer includes a conveyor, a recording head, a power supply, an ink receiver, a command receiver, and a controller. The controller executes: determining an ink amount to be discharged; determining a voltage value of a drive voltage and the number of ink droplets; raising the drive voltage; executing a flushing process, executing a printing process. The controller determines the voltage value such that the drive voltage becomes higher when the determined ink amount is not less than a first threshold value than when the determined ink amount is less than the first threshold value, and determines the number of ink droplets such that the number of ink droplets becomes larger when the determined ink amount is not less than a second threshold value than when the determined ink amount is less than the second threshold value.

CROSS REFERENCE TO RELATED APPLICATION

The present application claims priority from Japanese Patent ApplicationNo. 2016-129515 filed on Jun. 30, 2016, the disclosure of which isincorporated herein by reference in its entirety.

BACKGROUND Field of the Invention

The present invention relates to an ink-jet printer that records animage on a sheet, based on a recording command received from aninformation processing apparatus via a communication network.

Description of the Related Art

In the past, attempts have been made to reduce FPOT (abbreviation ofFirst Print Out Time) in an information processing apparatus and printerconnected via a communication network. FPOT is a time from a printinstruction being inputted to the external apparatus to a first sheetbeing discharged from the printer.

Reducing a time of a preparation process is conceivable as one ofmethods for reducing FPOT. The preparation process is a process thatshould be executed by the printer before recording an image on thesheet, and includes, for example, a flushing process in which arecording head is caused to discharge ink toward an ink receiver.

SUMMARY

However, generally, an amount of ink that should be discharged in theflushing process is increased/decreased based on a state of the printer.Moreover, if the amount of ink that should be discharged in the flushingprocess becomes large, the preparation process takes a long time,whereby FPOT deteriorates. On the other hand, if the amount of inkdischarged in the flushing process is insufficient, there is apossibility that image recording quality deteriorates.

The present teaching was made in view of the above-describedcircumstances, and has an object of providing an ink-jet printer inwhich FPOT is reduced while image recording quality is maintained.

An aspect of the present teaching provides an ink-jet printer,including:

a conveyor configured to convey a sheet in a conveyance direction;

a recording head configured to discharge ink droplets from a nozzle, ina sheet facing area facing the sheet conveyed by the conveyor;

a power supply configured to supply a drive voltage to the recordinghead;

an ink receiver;

a command receiver; and

a controller configured to control the conveyor, the recording head andthe power supply to execute:

-   -   determining an ink amount to be discharged toward the ink        receiver;    -   determining a voltage value of the drive voltage and the number        of ink droplets to discharge the determined ink amount to the        ink receiver;    -   raising the drive voltage of the power supply to the determined        voltage value;    -   performing a flushing process in which the determined number of        ink droplets are discharged toward the ink receiver, under a        condition that the command receiver receives a recording command        which is an instruction to record an image on the sheet and that        raising of the drive voltage has finished;    -   performing a printing process, under a condition that the        flushing process has finished;    -   under a condition that the determined ink amount is not less        than a first threshold value, determining the voltage value of        the drive voltage such that the drive voltage becomes higher        than the voltage value of the drive voltage determined when the        determined ink amount is less than the first threshold value,        and    -   under a condition that the determined ink amount is not less        than a second threshold value which is larger than the first        threshold value, determining the number of ink droplets such        that the number of ink droplets becomes larger than the number        of ink droplets determined when the determined ink amount is        less than the second threshold value.

An amount of ink able to be discharged from a nozzle per unit timebecomes larger the higher a drive voltage is. Accordingly, as in theabove-described configuration, when an ink amount that should bedischarged is greater than or equal to a first threshold value, thedrive voltage is set higher than when the ink amount that should bedischarged is less than the first threshold value. As a result, inkrequired to maintain image recording quality can be discharged whilesuppressing that execution time of a flushing process lengthens. On theother hand, the drive voltage has its upper limit value fixed, hencewhen the ink amount that should be discharged is greater than or equalto a second threshold value, the number of ink droplets discharged isset larger than when the ink amount that should be discharged is lessthan the second threshold value. As a result, ink required to maintainimage recording quality can be reliably discharged.

Due to the present teaching, the drive voltage is set higher when theink amount is greater than or equal to the first threshold value thanwhen the ink amount is less than the first threshold value, and thenumber of ink droplets is set larger when the ink amount is greater thanor equal to the second threshold value than when the ink amount is lessthan the second threshold value, hence ink required to maintain imagerecording quality can be discharged while suppressing that executiontime of the flushing process lengthens.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of external appearance of a multifunctionperipheral 10.

FIG. 2 is a longitudinal cross-sectional view showing schematically aninternal structure of a printer 11.

FIG. 3 is a plan view of a carriage 23 and guide rails 43, 44.

FIG. 4A is a schematic configuration diagram of a maintenance mechanism70, and FIG. 4B is a schematic configuration diagram of an ink receiver75.

FIGS. 5A to 5C are schematic configuration diagrams of a switchingmechanism 170, FIG. 5A showing a first state, FIG. 5B showing a secondstate, and FIG. 5C showing a third state.

FIG. 6 is a block diagram of the multifunction peripheral 10.

FIG. 7 is a flowchart of an image recording process.

FIG. 8 is a flowchart of an FLS condition determining process.

FIG. 9 is a timing chart showing execution timings of a firstpreparation process and a second preparation process.

FIGS. 10A to 10C are views showing a positional relationship of thecarriage 23 and the ink receiver 75, FIG. 10A showing a state where thecarriage 23 is positioned leftwards of the ink receiver 75, FIG. 10Bshowing a state where the carriage 23 is moving rightwards along aposition facing the ink receiver 75, and FIG. 10C showing a state wherethe carriage 23 is positioned rightwards of the ink receiver 75.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

An embodiment of the present teaching will be described below. Note thatthe embodiment described below is merely an example of the presentteaching, and it goes without saying that the embodiment of the presentteaching may be appropriately changed in a range that does not alter thegist of the present teaching. Furthermore, an up-down direction 7 isdefined with reference to a state in which a multifunction peripheral 10is usably disposed (state of FIG. 1), a front-rear direction 8 isdefined assuming a side provided with an opening 13 to be a near side(front surface), and a left-right direction 9 is defined viewing themultifunction peripheral 10 from the near side (front surface).

[Overall Configuration of Multifunction Peripheral 10]

As shown in FIG. 1, the multifunction peripheral 10 is roughly formedinto a rectangular parallelepiped. The multifunction peripheral 10includes a printer 11. The multifunction peripheral 10 is an example ofan ink-jet printer. Moreover, the multifunction peripheral 10 mayfurther include the likes of a scanner that reads a manuscript togenerate image data.

[Printer 11]

The printer 11 discharges ink, thereby recording on a sheet 12 (refer toFIG. 2) an image shown by the image data. That is, the printer 11 adoptsa so-called ink-jet recording system. As shown in FIG. 2, the printer 11includes feed sections 15A, 15B, feed trays 20A, 20B, a discharge tray21, a conveyance roller section 54, a recording section 24, a dischargeroller section 55, and a platen 42. The conveyance roller section 54 andthe discharge roller section 55 are examples of a conveyor.

[Feed Trays 20A, 20B and Discharge Tray 21]

The opening 13 (refer to FIG. 1) is formed in a front surface of theprinter 11. The feed trays 20A, 20B are inserted and removed in thefront-rear direction 8 via the opening 13. The feed trays 20A, 20B eachsupport a stacked plurality of the sheets 12. The discharge tray 21supports the sheet 12 discharged by the discharge roller section 55 viathe opening 13.

[Feed Sections 15A, 15B]

As shown in FIG. 2, the feed section 15A includes a feed roller 25A, afeed arm 26A, and a shaft 27A. The feed roller 25A is rotatablysupported by a distal end of the feed arm 26A. The feed arm 26A ispivotably supported by the shaft 27A which is supported by a frame ofthe printer 11. The feed arm 26A is pivotally biased toward the feedtray 20A by an elastic force due to the likes of its own weight or aspring. The feed section 15B includes a feed roller 25B, a feed arm 26B,and a shaft 27B. A specific configuration of the feed section 15B iscommon to that of the feed section 15A. As a result of the feed roller25A rotating by a forward rotational drive force of a feed motor 101(refer to FIG. 6) being transmitted to the feed roller 25A, the feedsection 15A feeds to a conveyance path 65 the sheet 12 supported by thefeed tray 20A. As a result of the feed roller 25B rotating by theforward rotational drive force of the feed motor 101 being transmittedto the feed roller 25B, the feed section 15B feeds to the conveyancepath 65 the sheet 12 supported by the feed tray 20B.

[Conveyance Path 65]

The conveyance path 65 indicates a space formed by guide members 18, 30and guide members 19, 31. The guide members 18, 30 and the guide members19, 31 face each other with a certain spacing between them on the insideof the printer 11. The conveyance path 65 is a path that extends from arear end section of the feed trays 20A, 20B to a rear side of theprinter 11. Moreover, the conveyance path 65 is a path that makes aU-turn while extending from a downward side to an upward side at therear side of the printer 11, and that passes through the recordingsection 24 to reach the discharge tray 21. Note that a conveyancedirection 16 of the sheet 12 in the conveyance path 65 is indicated by adot-chain line arrow in FIG. 2.

[Conveyance Roller Section 54]

The conveyance roller section 54 is disposed upstream in the conveyancedirection 16 of the recording section 24. The conveyance roller section54 includes a conveyance roller 60 and a pinch roller 61 that face eachother. The conveyance roller 60 is driven by a conveyance motor 102(refer to FIG. 6). The pinch roller 61 rotates in company with rotationof the conveyance roller 60. The sheet 12 is nipped by the conveyanceroller 60 that forwardly rotates by a forward rotational drive force ofthe conveyance motor 102 being transmitted thereto, and the pinch roller61, whereby the sheet 12 is conveyed along the conveyance direction 16.Moreover, the conveyance roller 60 reversely rotates in a reverseorientation to forward rotation, by a reverse rotational drive force ofthe conveyance motor 102 being transmitted thereto.

[Discharge Roller Section 55]

The discharge roller section 55 is disposed downstream in the conveyancedirection 16 of the recording section 24. The discharge roller section55 includes a discharge roller 62 and a spur wheel 63 that face eachother. The discharge roller 62 is driven by the conveyance motor 102.The spur wheel 63 rotates in company with rotation of the dischargeroller 62. The sheet 12 is nipped by the discharge roller 62 thatforwardly rotates by the forward rotational drive force of theconveyance motor 102 being transmitted thereto, and the spur wheel 63,whereby the sheet 12 is conveyed along the conveyance direction 16.

[Resist Sensor 120]

As shown in FIG. 2, the printer 11 includes a resist sensor 120. Theresist sensor 120 is arranged upstream in the conveyance direction 16 ofthe conveyance roller section 54. The resist sensor 120 outputsdifferent detection signals depending on whether the sheet 12 exists atan arrangement position of the resist sensor 120 or not. The resistsensor 120 outputs a high level signal to a later-mentioned controller130 (refer to FIG. 6), based on the sheet 12 existing at the arrangementposition. On the other hand, the resist sensor 120 outputs a low levelsignal to the controller 130, based on the sheet 12 not existing at thearrangement position.

[Rotary Encoder 121]

As shown in FIG. 6, the printer 11 includes a rotary encoder 121 thatgenerates a pulse signal based on rotation of the conveyance roller 60(in other words, rotational drive of the conveyance motor 102). Therotary encoder 121 includes an encoder disk and an optical sensor. Theencoder disk rotates along with rotation of the conveyance roller 60.The optical sensor reads the rotating encoder disk to generate a pulsesignal and outputs the generated pulse signal to the controller 130.

[Recording Section 24]

As shown in FIG. 2, the recording section 24 is disposed between theconveyance roller section 54 and the discharge roller section 55 in theconveyance direction 16. Moreover, the recording section 24 is disposedfacing the platen 42 in the up-down direction 7. The recording section24 includes a carriage 23, a recording head 39, an encoder sensor 38A,and a media sensor 122. Moreover, as shown in FIG. 3, an ink tube 32 anda flexible flat cable 33 are connected to the carriage 23. The ink tube32 supplies ink of an ink cartridge to the recording head 39. Theflexible flat cable 33 electrically connects a control board on whichthe controller 130 is mounted and the recording head 39.

As shown in FIG. 3, the carriage 23 is supported by guide rails 43, 44each provided extending in the left-right direction 9, at positionsseparated in the front-rear direction 8. The carriage 23 is coupled to apublicly known belt mechanism disposed in the guide rail 44. Note thatthis belt mechanism is driven by a carriage motor 103 (refer to FIG. 6).In other words, the carriage 23 which is connected to the belt mechanismthat makes a circuitous motion due to drive of the carriage motor 103,can make reciprocating movement in the left-right direction 9. Theleft-right direction 9 is an example of a scanning direction.

As shown in FIG. 2, the recording head 39 is mounted in the carriage 23.A plurality of nozzles 40 are formed in a lower surface (hereafter,described as “nozzle surface”) of the recording head 39. The recordinghead 39 discharges ink droplets from the nozzle 40 due to a vibratingelement such as a piezo element being vibrated. In a process of thecarriage 23 moving, the recording head 39 discharges ink droplets ontothe sheet 12 supported by the platen 42. As a result, an image isrecorded on the sheet 12.

The vibrating element is an example of a discharge energy generatingelement that generates, from a drive voltage applied by a power supplysection 110, energy (that is, vibrational energy) for discharging inkdroplets from the nozzle. However, a specific example of the dischargeenergy generating element is not limited to a vibrating element, and maybe, for example, a heater that generates thermal energy. Moreover, theheater may heat the ink by thermal energy generated from the drivevoltage applied by the power supply section 110 and discharge foamed inkdroplets from the nozzle. Moreover, the recording head 39 according tothe present embodiment discharges pigment ink, but it may discharge dyeink.

Note that the recording head 39 may, for example, discharge from thenozzle 40 a main droplet and a satellite droplet. The main droplet andthe satellite droplet are, for example, separate droplets at a stage ofbeing discharged from the nozzle 40, and coalesce mid-air to impact onsubstantially the same position of the sheet and configure one dot onthe sheet. In the present specification, a unit of ink configuring onedot on the sheet is defined as “one droplet” or “one shot”. That is, alater-mentioned “FLS shot number” makes a count of one shot includingthe main droplet and the satellite droplet that impact on substantiallythe same position on the sheet.

As shown in FIGS. 2 and 4, the plurality of nozzles 40 are arranged inthe front-rear direction 8 and the left-right direction 9. A pluralityof the nozzles 40 arranged in the front-rear direction 8 (hereafter,described as a “nozzle column”) discharge identically-colored inkdroplets. The nozzle surface has formed therein 24 nozzle columnsarranged in the left-right direction 9. Moreover, six adjacent nozzlecolumns at a time discharge identically-colored ink droplets. In thepresent embodiment, the six nozzle columns from a right end dischargeink droplets of black ink, the six nozzle columns next to theblack-ink-droplet-discharging nozzle columns discharge ink droplets ofyellow ink, the six nozzle columns next to theyellow-ink-droplet-discharging nozzle columns discharge ink droplets ofcyan ink, and the six nozzle columns from a left end discharge inkdroplets of magenta ink. However, the number of nozzle columns andcombination of colors of ink discharged are not limited to those of thepreviously mentioned example.

The black ink and the magenta ink are examples of a first color, and thecyan ink and the yellow ink are examples of a second color. The secondcolor is a color whose change in viscosity with drying is smallercompared to that of the first color. The change in viscosity with dryingchanges by a composition configuring the ink, for example. Moreover, thenozzle 40 discharging ink droplets of the first color is an example of afirst nozzle, and the nozzle 40 discharging ink droplets of the secondcolor is an example of a second nozzle.

Moreover, as shown in FIG. 3, a strip-like encoder strip 38B extendingin the left-right direction 9 is disposed in the guide rail 44. Theencoder sensor 38A is mounted on a lower surface of the carriage 23 at aposition facing the encoder strip 38B. In the process of the carriage 23moving, the encoder sensor 38A reads the encoder strip 38B to generate apulse signal and outputs the generated pulse signal to the controller130. The encoder sensor 38A and the encoder strip 38B configure acarriage sensor 38 (refer to FIG. 6).

[Media Sensor 122]

As shown in FIG. 2, the media sensor 122 is mounted in the carriage 23on the lower surface (a surface facing the platen 42) of the carriage23. The media sensor 122 includes a light-emitting section configuredfrom the likes of a light-emitting diode and a light-receiver configuredfrom the likes of an optical sensor. The light-emitting sectionirradiates toward the platen 42 light of a light amount instructed bythe controller 130. The light irradiated from the light-emitting sectionis reflected by the platen 42 or the sheet 12 supported by the platen42, and the reflected light is received by the light-receiver. The mediasensor 122 outputs to the controller 130 a detection signal based on areceived light amount of the light-receiver. For example, the mediasensor 122 outputs to the controller 130 a detection signal where thelarger the received light amount is, the higher a level of the detectionsignal is.

[Platen 42]

As shown in FIG. 2, the platen 42 is disposed between the conveyanceroller section 54 and the discharge roller section 55 in the conveyancedirection 16. The platen 42 is disposed facing the recording section 24in the up-down direction 7. The platen 42 supports from below the sheet12 conveyed by at least one of the conveyance roller section 54 and thedischarge roller section 55. Optical reflectance of the platen 42 in thepresent embodiment is set lower than that of the sheet 12.

[Maintenance Mechanism 70]

As shown in FIG. 3, the printer 11 further includes a maintenancemechanism 70. The maintenance mechanism 70 performs maintenance of therecording head 39. In more detail, the maintenance mechanism 70 executesa purge operation that sucks up ink or air in the nozzle 40 and foreignmatter adhered to the nozzle surface. Moreover, the ink or air in thenozzle 40 and foreign matter adhered to the nozzle surface will beexpressed below as ink, and so on. The ink, and so on, that has beensucked up and removed by the maintenance mechanism 70 is stored in aliquid discharge tank 74 (refer to FIG. 4A).

As shown in FIG. 3, the maintenance mechanism 70 is disposed in aposition displaced to one side (rightwards) in the scanning directionfrom a sheet facing area. The sheet facing area refers to an area in thescanning direction where the sheet 12 conveyed by the conveyor, and thecarriage 23, are able to face each other. As shown in FIG. 4A, themaintenance mechanism 70 includes a cap 71, a tube 72, and a pump 73.

The cap 71 is configured by rubber. The cap 71 is disposed at a positionthat faces the recording head 39 of the carriage 23 when the carriage 23is positioned in a second position displaced rightwards in the scanningdirection from the sheet facing area. The tube 72 reaches from the cap71 to the liquid discharge tank 74 via the pump 73. The pump 73 is, forexample, a rotary type tube pump. The pump 73 is driven by theconveyance motor 102 to suck up the ink, and so on, in the nozzle 40 viathe cap 71 and the tube 72 and discharge it to the liquid discharge tank74 via the tube 72.

The cap 71 is, for example, configured capable of moving between acovering position and a separated position that are separated in theup-down direction 7. The cap 71 in the covering position closelycontacts the recording head 39 of the carriage 23 in the secondposition, thereby covering the nozzle surface. On the other hand, thecap 71 in the separated position is separated from the nozzle surface.The cap 71 moves between the covering position and the separatedposition by means of an unillustrated raising-and-lowering mechanismdriven by the feed motor 101. However, a specific configuration forcausing the recording head 39 and the cap 71 to contact/separate is notlimited to the previously mentioned example.

As another example, the cap 71, instead of being moved by theraising-and-lowering mechanism driven by the feed motor 101, may bemoved by an unillustrated link mechanism that operates in conjunctionwith movement of the carriage 23. The link mechanism is capable ofposture change between a first posture in which the cap 71 is held inthe covering position and a second posture in which the cap 71 is heldin the separated position. Moreover, the link mechanism, for example,undergoes posture change from the second posture to the first posture bybeing abutted on by the carriage 23 moving toward the second position.On the other hand, the link mechanism, for example, undergoes posturechange from the first posture to the second posture by being moved awayfrom by the carriage 23 moving toward a first position.

As another example, the multifunction peripheral 10 may include araising-and-lowering mechanism that moves the guide rails 43, 44 in theup-down direction 7, instead of the mechanism that moves the cap 71.That is, the carriage 23 in the second position is raised/lowered alongwith the guide rails 43, 44 that are raised/lowered by theraising-and-lowering mechanism. On the other hand, the cap 71 is fixedin a position facing the recording head 39 of the carriage 23 in thesecond position. Then, by the guide rails 43, 44 and the carriage 23being lowered to a certain position by the raising-and-loweringmechanism, the nozzle surface of the recording head 39 is covered by thecap 71. Moreover, by the guide rails 43, 44 and the carriage 23 beingraised to a certain position by the raising-and-lowering mechanism, therecording head 39 and the cap 71 separate and the carriage 23 becomesmovable in the scanning direction.

As yet another example, the multifunction peripheral 10 may include bothof the raising-and-lowering mechanism that moves the cap 71 and theraising-and-lowering mechanism that moves the guide rails 43, 44. Then,by the carriage 23 and the cap 71 being moved in an orientation causingthem to approach each other, the cap 71 may be caused to closely contactthe nozzle surface. Furthermore, by the carriage 23 and the cap 71 beingmoved in an orientation causing them to separate from each other, thecap 71 may be caused to separate from the nozzle surface. That is, thepreviously mentioned covering position and separated position refer torelative positions of the recording head 39 and the cap 71. Then, allthat is required is to change the relative positions of the recordinghead 39 and the cap 71 by moving one or both of the recording head 39and the cap 71. In other words, all that is required is to change therelative positions of the recording head 39 and the cap 71 by moving therecording head 39 and the cap 71 relatively.

[Cap Sensor 123]

A cap sensor 123 outputs different detection signals depending onwhether the cap 71 is in the covering position or not. The cap sensor123 outputs a high level signal to the controller 130 based on the cap71 being in the covering position. On the other hand, the cap sensor 123outputs a low level signal to the controller 130 based on the cap 71being in a position different from the covering position. Note that whenthe cap 71 has been moved from the covering position to the separatedposition, the detection signal outputted from the cap sensor 123 changesfrom the high level signal to the low level signal before the cap 71reaches the separated position.

[Ink Receiver 75]

As shown in FIG. 3, the printer 11 further includes an ink receiver 75.The ink receiver 75 is disposed in a position displaced to the otherside (leftwards) in the scanning direction from the sheet facing area.In more detail, the ink receiver 75 is disposed in a position that facesthe recording head 39 of the carriage 23 when the carriage 23 ispositioned in the first position displaced leftwards in the scanningdirection from the sheet facing area. Note that the maintenancemechanism 70 and the ink receiver 75 may be provided on the same side inthe scanning direction from the sheet facing area. However, the firstposition and the second position are positions separated in the scanningdirection.

As shown in FIG. 4B, the ink receiver 75 has roughly a rectangularparallelepiped box shape with an opening 75A formed on its uppersurface. A width of the opening 75A in the scanning direction is shorterthan a width of the nozzle surface in the scanning direction. Moreover,guide plates 75B, 75C are provided on the inside of the ink receiver 75at positions separated in the left-right direction 9. The guide plates75B, 75C are plate-like members extending in the up-down direction 7 andthe front-rear direction 8. Moreover, the guide plates 75B, 75C areprovided inclined in the left-right direction 9. In more detail, theguide plates 75B, 75C are disposed inside the ink receiver 75 such thatleft surfaces of the guide plates 75B, 75C face obliquely upward left.The guide plates 75B, 75C guide ink droplets discharged from therecording head 39 toward an interior surface (bottom surface) of the inkreceiver 75. However, the number of guide plates 75B, 75C is not limitedto two.

[Drive Force Transmitting Mechanism 80]

As shown in FIG. 6, the printer 11 further includes a drive forcetransmitting mechanism 80. The drive force transmitting mechanism 80transmits a drive force of the feed motor 101 and the conveyance motor102 to the feed rollers 25A, 25B, the conveyance roller 60, thedischarge roller 62, the raising-and-lowering mechanism of the cap 71,and the pump 73. The drive force transmitting mechanism 80 is configuredby combining all or some of the likes of a gear wheel, a pulley, anendless annular belt, a planetary gear mechanism (pendulum gearmechanism), and a one-way clutch. Moreover, the drive force transmittingmechanism 80 includes a switching mechanism 170 (refer to FIG. 5) thatswitches a transmission destination of the drive force of the feed motor101 and the conveyance motor 102.

[Switching Mechanism 170]

As shown in FIG. 3, the switching mechanism 170 is disposed in aposition displaced to the one side in the scanning direction from thesheet facing area. Moreover, the switching mechanism 170 is disposedbelow the guide rail 43. As shown in FIG. 5, the switching mechanism 170includes a slide member 171, drive gears 172, 173, driven gears 174,175, 176, 177, a lever 178, and springs 179, 180 that are examples of abiasing member. The switching mechanism 170 is configured switchable toa first state, a second state, and a third state.

The first state is a state where the drive force of the feed motor 101is transmitted to the feed roller 25A, but is not transmitted to thefeed roller 25B and the raising-and-lowering mechanism of the cap 71.The second state is a state where the drive force of the feed motor 101is transmitted to the feed roller 25B, but is not transmitted to thefeed roller 25A and the raising-and-lowering mechanism of the cap 71.The third state is a state where the drive force of the feed motor 101is transmitted to the raising-and-lowering mechanism of the cap 71, butis not transmitted to the feed rollers 25A, 25B. Moreover, the firststate and the second state are states where the drive force of theconveyance motor 102 is transmitted to the conveyance roller 60 and thedischarge roller 62, but is not transmitted to the pump 73. The secondstate is a state where the drive force of the conveyance motor 102 istransmitted to all of the conveyance roller 60, the discharge roller 62,and the pump 73.

The slide member 171 is a roughly circular column shaped membersupported by a support shaft (indicated by broken lines in FIG. 5)extending in the left-right direction 9. Moreover, the slide member 171is configured to be slidable in the left-right direction 9 along thesupport shaft. Furthermore, the slide member 171 supports the drivegears 172, 173 in a state of each being independently rotatable, atpositions displaced in the left-right direction 9 on an outer surface ofthe slide member 171. That is, the slide member 171 and the drive gears172, 173 slide in the left-right direction 9 as one united body.

The drive gear 172 rotates by the rotational drive force of the feedmotor 101 being transmitted thereto. The drive gear 172 meshes with oneof the driven gears 174, 175, 176. In more detail, when the switchingmechanism 170 is in the first state, the drive gear 172 meshes with thedriven gear 174 as shown in FIG. 5A. In addition, when the switchingmechanism 170 is in the second state, the drive gear 172 meshes with thedriven gear 175 as shown in FIG. 5B. Furthermore, when the switchingmechanism 170 is in the third state, the drive gear 172 meshes with thedriven gear 176 as shown in FIG. 5C.

The drive gear 173 rotates by the rotational drive force of theconveyance motor 102 being transmitted thereto. When the switchingmechanism 170 is in the first state and the second state, meshing of thedrive gear 173 with the driven gear 176 is released as shown in FIGS. 5Aand 5B. Moreover, when the switching mechanism 170 is in the thirdstate, the drive gear 173 meshes with the driven gear 177 as shown inFIG. 5C.

The driven gear 174 meshes with a gear train rotating the feed roller25A. That is, meshing of the drive gear 172 and the driven gear 174results in the rotational drive force of the feed motor 101 beingtransmitted to the feed roller 25A. Moreover, release of meshing of thedrive gear 172 and the driven gear 174 results in the rotational driveforce of the feed motor 101 failing to be transmitted to the feed roller25A.

The driven gear 175 meshes with a gear train rotating the feed roller25B. That is, meshing of the drive gear 172 and the driven gear 175results in the rotational drive force of the feed motor 101 beingtransmitted to the feed roller 25B. Moreover, release of meshing of thedrive gear 172 and the driven gear 175 results in the rotational driveforce of the feed motor 101 failing to be transmitted to the feed roller25B.

The driven gear 176 meshes with a gear train driving theraising-and-lowering mechanism of the cap 71. That is, meshing of thedrive gear 172 and the driven gear 176 results in the rotational driveforce of the feed motor 101 being transmitted to theraising-and-lowering mechanism of the cap 71. Moreover, release ofmeshing of the drive gear 172 and the driven gear 176 results in therotational drive force of the feed motor 101 failing to be transmittedto the raising-and-lowering mechanism of the cap 71.

The driven gear 177 meshes with a gear train driving the pump 73. Thatis, meshing of the drive gear 173 and the driven gear 177 results in therotational drive force of the conveyance motor 102 being transmitted tothe pump 73. Moreover, release of meshing of the drive gear 173 and thedriven gear 177 results in the rotational drive force of the conveyancemotor 102 failing to be transmitted to the pump 73. On the other hand,the rotational drive force of the conveyance motor 102 is transmitted tothe conveyance roller 60 and the discharge roller 62 withoutintervention of the switching mechanism 170. That is, the conveyanceroller 60 and the discharge roller 62 rotate by the rotational driveforce of the conveyance motor 102, regardless of the state of theswitching mechanism 170.

The lever 178 is supported by the supporting shaft at a positionadjacent on the right to the slide member 171. In addition, the lever178 slides in the left-right direction 9 along the supporting shaft.Furthermore, the lever 178 projects upwardly. Moreover, a tip of thelever 178 reaches to a position where it can be abutted on by thecarriage 23, via an opening 43A provided in the guide rail 43. The lever178 slides in the left-right direction 9 by being abutted on and movedaway from by the carriage 23. Moreover, the switching mechanism 170includes a plurality of locking sections that lock the lever 178.Moreover, the lever 178 that has been locked in the locking section canstay in its position, even after having been moved away from by thecarriage 23.

The springs 179, 180 are supported by the supporting shaft. One end (aleft end) of the spring 179 abuts on the frame of the printer 11, andthe other end (a right end) of the spring 179 abuts on a left endsurface of the slide member 171. That is, the spring 179 biases in arightward orientation the slide member 171 and the lever 178 abutting onthe slide member 171. One end (a right end) of the spring 180 abuts onthe frame of the printer 11, and the other end (a left end) of thespring 180 abuts on a right end surface of the lever 178. That is, thespring 180 biases in a leftward orientation the lever 178 and the slidemember 171 abutting on the lever 178. Furthermore, a biasing force ofthe spring 180 is larger than a biasing force of the spring 179.

When the lever 178 is locked in a first locking section, the switchingmechanism 170 is in the first state. Moreover, the lever 178 pressed onby the carriage 23 moving in the rightward orientation opposes thebiasing force of the spring 180 to move in the rightward orientation andbe locked in a second locking section positioned rightwards of the firstlocking section. As a result, the slide member 171 moves in therightward orientation following movement of the lever 178, due to thebiasing force of the spring 179. As a result, the switching mechanism170 is switched from the first state shown in FIG. 5A to the secondstate shown in FIG. 5B. That is, the switching mechanism 170 is switchedfrom the first state to the second state by the lever 178 being abuttedon by the carriage 23 heading from the first position to the secondposition.

In addition, the lever 178 pressed on by the carriage 23 moving to thesecond position opposes the biasing force of the spring 180 to move inthe rightward orientation and be locked in a third locking sectionpositioned even more rightwards than the second locking section. As aresult, the slide member 171 moves in the rightward orientationfollowing movement of the lever 178, due to the biasing force of thespring 179. As a result, the switching mechanism 170 is switched fromthe first state shown in FIG. 5A or the second state shown in FIG. 5B tothe third state shown in FIG. 5C. That is, the switching mechanism 170is switched to the third state by the lever 178 being abutted on by thecarriage 23 moving to the second position.

Furthermore, locking in the third locking section, of the lever 178 thathas been pressed on by the carriage 23 moving even more rightwards thanthe second position and then moved away from by the carriage 23 movingin the leftward orientation, is released. As a result, the slide member171 and the lever 178 are moved in the leftward orientation by thebiasing force of the spring 180. Then, the lever 178 is locked in thefirst locking section. As a result, the switching mechanism 170 isswitched from the third state shown in FIG. 5C to the first state shownin FIG. 5A. That is, the switching mechanism 170 is switched from thethird state to the first state by the lever 178 being abutted on andmoved away from by the carriage 23 moving from the second position tothe first position.

That is, the state of the switching mechanism 170 is switched byabutting/separation of the carriage 23 on/from the lever 178. In otherwords, the transmission destinations of the drive forces of the feedmotor 101 and the conveyance motor 102 are switched by the carriage 23.Note that the state of the switching mechanism 170 according to thepresent embodiment cannot be switched directly from the third state tothe second state, and as previously mentioned, is required to beswitched from the third state to the first state and further switchedfrom the first state to the second state.

[Power Supply Section 110]

As shown in FIG. 6, the multifunction peripheral 10 has a power supplysection 110. The power supply section 110 supplies each configuringelement of the multifunction peripheral 10 with electric power suppliedfrom an external power supply via a power supply plug. In more detail,the power supply section 110 outputs electric power acquired from theexternal power supply to each of the motors 101-103 and the recordinghead 39 as drive electric power (for example, 24 to 26 V), and to thecontroller 130 as control electric power (for example, 5 V).

Moreover, the power supply section 110 is capable of switching between adrive state and a sleep state, based on a power supply signal outputtedfrom the controller 130. In more detail, the controller 130 switches thepower supply section 110 from the sleep state to the drive state byoutputting a HIGH level power supply signal (for example, 5 V).Moreover, the controller 130 switches the power supply section 110 fromthe drive state to the sleep state by outputting a LOW level powersupply signal (for example, 0 V).

The drive state is a state where drive electric power is being outputtedto the motors 101-103 and the recording head 39. In other words, thedrive state is a state where the motors 101-103 and the recording head39 are operable. The sleep state is a state where drive electric poweris not being outputted to the motors 101-103 and the recording head 39.In other words, the sleep state is a state where the motors 101-103 andthe recording head 39 are inoperable. On the other hand, althoughillustration of this is omitted, the power supply section 110 outputscontrol electric power to the controller 130 and a communication part50, regardless of whether the power supply section 110 is in the drivestate or in the sleep state.

[Controller 130]

As shown in FIG. 6, the controller 130 includes a CPU 131, a ROM 132, aRAM 133, an EEPROM 134, and an ASIC 135, and these are connected by aninternal bus 137. The ROM 132 stores the likes of a program for the CPU131 to control various kinds of operations. The RAM 133 is used as astorage area for temporarily recording the likes of data or a signalemployed when the CPU 131 executes the above-described program, or as awork area of data processing. The EEPROM 134 stores setting informationthat should be held even after the power supply is turned off.

In the present embodiment, the EEPROM 134 stores time informationindicating a time (hereafter, described as “FLS execution time”) when alater-mentioned flushing process was most recently executed. Thecontroller 130 acquires the time information from a system clock (notillustrated) at an execution time of the flushing process, and storesthe acquired time information in the EEPROM 134. In addition, thecontroller 130, based on there being time information already stored inthe EEPROM 134, overwrites the time information that has already beenstored with new time information. Note that the time information is notlimited to the time when the flushing process was most recentlyexecuted, and may indicate a time when a later-mentioned recordingprocess was most recently executed.

The feed motor 101, the conveyance motor 102, and the carriage motor 103are connected to the ASIC 135. The ASIC 135 generates a drive signal forrotating each of the motors, and outputs the generated drive signal toeach of the motors. Each of the motors is forward rotationally driven orreverse rotationally driven based on the drive signal from the ASIC 135.Moreover, the controller 130 causes ink droplets to be discharged fromthe nozzle 40 by applying a drive voltage of the power supply section110 to the vibrating element of the recording head 39.

Moreover, the communication part 50 is connected to the ASIC 135. Thecommunication part 50 is a communication interface capable ofcommunicating with an information processing apparatus 51. That is, thecontroller 130 outputs various kinds of information to the informationprocessing apparatus 51 via the communication part 50, and receivesvarious kinds of information from the information processing apparatus51 via the communication part 50. The communication part 50 may transmitand receive a wireless signal by a communication protocol based on Wi-Fi(registered trademark of Wi-Fi Alliance), for example, or may be aninterface to which a LAN cable or USB cable is connected. Note that inFIG. 6, the information processing apparatus 51 is surrounded by adotted line frame, thereby distinguishing it from configuring elementsof the multifunction peripheral 10.

Furthermore, the resist sensor 120, the rotary encoder 121, the carriagesensor 38, the media sensor 122, and the cap sensor 123 are connected tothe ASIC 135. The controller 130 detects a position of the sheet 12,based on the detection signal outputted from the resist sensor 120 andthe pulse signal outputted from the rotary encoder 121. In addition, thecontroller 130 detects a position of the carriage 23, based on the pulsesignal outputted from the carriage sensor 38. Moreover, the controller130 detects a position of the cap 71, based on the detection signaloutputted from the cap sensor 123.

Furthermore, the controller 130 detects the sheet 12 that has beenconveyed by the conveyor, based on the detection signal outputted fromthe media sensor 122. In more detail, the controller 130 compares anamount of change in signal level of temporally adjacent detectionsignals and a predetermined threshold value. Then, the controller 130,based on the amount of change in signal level having attained thethreshold value or more, detects that a leading edge of the sheet 12 hasreached a position facing the media sensor 122 in the up-down direction7.

[Image Recording Process]

Next, an image recording process of the present embodiment will bedescribed with reference to FIGS. 7 to 10. The multifunction peripheral10 begins the image recording process based on having received a commandfrom the information processing apparatus 51 via the communication part50. Note that at a start time point of the image recording process, thecarriage 23 is assumed to be positioned in the second position, the cap71 is assumed to be positioned in the covering position, and theswitching mechanism 170 is assumed to be in the third state. Each of theprocesses below may be executed by the CPU 131 reading the programstored in the ROM 132, or may be achieved by a hardware circuit mountedin the controller 130. Moreover, an execution sequence of each of theprocesses may be appropriately changed in a range that does not alterthe gist of the present teaching.

First, although illustration of this is omitted, the informationprocessing apparatus 51, based on, for example, having received from auser an instruction to make the multifunction peripheral 10 execute theimage recording process, transmits a preceding command to themultifunction peripheral 10. The preceding command is a command thatgives prior notice of transmission of a later-mentioned recordingcommand. Next, the information processing apparatus 51, based on havingtransmitted the preceding command, converts to raster data image datadesignated by the user. Then, the information processing apparatus 51,based on having generated the raster data, transmits the recordingcommand to the multifunction peripheral 10. The recording command is acommand to record on the sheet the image indicated by the raster data.

The controller 130, based on having received the preceding command fromthe information processing apparatus 51 via the communication part 50(S11: Preceding Command), executes an FLS condition determining process(S12). The FLS condition determining process is a process fordetermining execution conditions of the flushing process. In moredetail, the FLS condition determining process is a process thatdetermines an ink amount which should be discharged in the flushingprocess, and that determines an FLS voltage, the FLS shot number, a CRspeed, and an FLS number-of-times, for discharging ink of said inkamount. Details of the FLS condition determining process will bedescribed with reference to FIG. 8.

Note that the FLS voltage is a drive voltage applied to the recordinghead in the flushing process. The FLS shot number is the total number ofink droplets discharged from each of the nozzles 40 in the flushingprocess. The CR speed is a movement speed of the carriage 23 in theflushing process. The FLS number-of-times is the number of times offlushing processes. The FLS voltage, the FLS shot number, the CR speed,and the FLS number-of-times are an example of execution conditions ofthe flushing process.

[FLS Condition Determining Process]

First, the controller 130 acquires time information indicating a currenttime, from the system clock. Then, the controller 130 calculates adifference between the FLS execution time indicated by the timeinformation stored in the EEPROM 134 and the current time, as an elapsedtime T from the flushing process being most recently executed to thepreceding command being received. This process is an example of ameasurement process. However, a method of measuring the elapsed time Tis not limited to the previously mentioned example. Then, the controller130 compares the elapsed time T and threshold times T₁, T₂, T₃, T₄ (S21to S24). The threshold times T₁, T₂, T₃, T₄ are values pre-stored in theEEPROM 134, and for the threshold times, it holds that T₁<T₂<T₃<T₄.

The controller 130, based on the elapsed time T being less than thethreshold time T₁ (S21: Yes), determines an ink amount to be dischargedin the flushing process to be 1500 pl (S25). Then, the controller 130determines the FLS voltage to be 24 V, determines the FLS shot number tobe 50, determines the CR speed to be 21 ips, and determines the FLSnumber-of-times to be one, as execution conditions of the flushingprocess for discharging 1500 pl of ink (S30 to S33).

In addition, the controller 130, based on the elapsed time T beinggreater than or equal to the threshold time T₁ and less than thethreshold time T₂ (S22: Yes), determines the ink amount to be 2000 pl(S26). Then, the controller 130 determines the FLS voltage to be 26 V,determines the FLS shot number to be 50, determines the CR speed to be21 ips, and determines the FLS number-of-times to be one, as executionconditions of the flushing process for discharging 2000 pl of ink (S34to S37).

Moreover, the controller 130, based on the elapsed time T being greaterthan or equal to the threshold time T₂ and less than the threshold timeT₃ (S23: Yes), determines the ink amount to be 3000 pl (S27). Then, thecontroller 130 determines the FLS voltage to be 26 V, determines the FLSshot number to be 80-100, determines the CR speed to be 21 ips, anddetermines the FLS number-of-times to be one, as execution conditions ofthe flushing process for discharging 3000 pl of ink (S38 to S41).

In addition, the controller 130, based on the elapsed time T beinggreater than or equal to the threshold time T₃ and less than thethreshold time T₄ (S24: Yes), determines the ink amount to be 15000 pl(S28). Then, the controller 130 determines the FLS voltage to be 26 V,determines the FLS shot number to be 400-500, determines the CR speed tobe 4 ips, and determines the FLS number-of-times to be one, as executionconditions of the flushing process for discharging 15000 pl of ink (S42to S45).

Furthermore, the controller 130, based on the elapsed time T beinggreater than or equal to the threshold time T₄ (S24: No), determines theink amount to be 50000 pl (S29). Then, the controller 130 determines theFLS voltage to be 26 V, determines the FLS shot number to be 1200-1500,determines the CR speed to be 4 ips, and determines the FLSnumber-of-times to be three, as execution conditions of the flushingprocess for discharging 50000 pl of ink (S46 to S49).

That is, the controller 130 determines the ink amount such that thelonger the elapsed time T from ink droplets being most recentlydischarged from the nozzle 40 is, the larger the ink amount isdetermined to be. An ink amount of between 1500 pl and 2000 pl is anexample of a first threshold value, an ink amount of between 2000 pl and3000 pl is an example of a second threshold value, an ink amount ofbetween 3000 pl and 15000 pl is an example of a third threshold value,and an ink amount of between 15000 pl and 50000 pl is an example of afourth threshold value. The process of steps S21 to S45 is an example ofan ink amount determining process.

Note that a parameter for determining the ink amount is not limited tothe elapsed time T. As another example, the controller 130 may determinethe ink amount such that the lower a temperature in a periphery of therecording head 39 is, the larger the ink amount is determined to be. Asyet another example, the controller may determine the ink amount suchthat the lower a humidity in the periphery of the recording head 39 is,the larger the ink amount is determined to be. Temperature and humidityin the periphery of the recording head 39 should be detected by a sensormounted in the likes of the carriage 23, for example. Moreover, theparameter for determining the ink amount is not limited to one, and itis possible for a plurality of the previously mentioned parameters to becombined.

That is, the controller 130 sets the FLS voltage, the FLS shot number,the CR speed, and the FLS number-of-times such that the larger the inkamount determined in steps S21 to S29 is, the higher the FLS voltage isset, the larger the FLS shot number is set, the slower the CR speed isset, and the larger the FLS number-of-times is set. However, withincrease in the determined ink amount, the controller 130 first raisesthe FLS voltage, next increases the FLS shot number, next slows the CRspeed, and next increases the FLS number-of-times. The process of stepsS30 to S49 is an example of a condition determining process.

In more detail, the controller 130 determines the FLS voltage to be 24 Vwhen the determined ink amount is less than the first threshold value,and determines the FLS voltage to be 26 V when the determined ink amountis greater than or equal to the first threshold value. 24 V is anexample of a predetermined minimum voltage, and 26 V is an example of apredetermined maximum voltage. Moreover, the minimum voltage of thepresent embodiment matches a drive voltage during execution of thelater-mentioned recording process.

Note that the present embodiment has described an example in which theFLS voltage is fixed at the minimum voltage 24 V when the ink amount isless than the first threshold value and the FLS voltage is fixed at themaximum voltage 26 V when the ink amount is greater than or equal to thefirst threshold value. However, a method of determining the FLS voltageis not limited to this. For example, in the case that the determined inkamount is less than the first threshold value, the controller 130 maydetermine the FLS voltage such that the larger the ink amount is, thehigher the FLS voltage is determined to be, within a range of theminimum voltage and the maximum voltage.

Moreover, the controller 130 determines the FLS shot number to be 50when the determined ink amount is less than the second threshold value,and sets the FLS shot number such that the larger the ink amount is, thelarger the FLS shot number is set, when the determined ink amount isgreater than or equal to the second threshold value. Note that thepresent embodiment has described an example in which the FLS shot numberis fixed at 50 when the ink amount is less than the second thresholdvalue. However, a method of determining the FLS shot number is notlimited to this. For example, in the case that the determined ink amountis less than the second threshold value, the controller 130 maydetermine the number of ink droplets such that the larger the ink amountis, the larger the number of ink droplets is determined to be, within apredetermined limit range. On the other hand, in the case that thedetermined ink amount is less than the second threshold value, thecontroller 130 may determine the number of ink droplets such that thelarger the ink amount is, the larger the number of ink droplets isdetermined to be, exceeding the previously mentioned limit range.

The limit range refers to a range of the FLS shot number whereby it ispossible that in the case where, for example, other execution conditionsof the flushing process (that is, the FLS voltage, the CR speed, and theFLS number-of-times) are identical, execution times of the flushingprocess are substantively identical and a necessary ink amount isdischarged. That is, even if the FLS shot number has varied within thelimit range, the execution time of the flushing process does notsubstantively change, and the necessary ink amount is discharged. As anexample, the limit range is a range (for example, 45 to 55) that is areference number of ink droplets (for example, 50) increased/decreasedby 10% of the reference number. That is, the FLS shot number determinedin S35 (for example, 45) may be less than the FLS shot number determinedin S31 (for example, 50), provided they are within the limit range.

Now, viscosity of ink in the recording head 39 is higher when theelapsed time T is greater than or equal to the threshold time T₁ andless than the threshold time T₂ (S22: Yes) than when the elapsed time Tis less than the threshold time T₁ (S21: Yes). Moreover, the ink amountdetermined in S26 (2000 pl) is larger than the ink amount determined inS25 (1500 pl). That is, if the FLS shot number is assumed to have beendetermined as previously mentioned in S31 and S35, then in the flushingprocess when the elapsed time T is greater than or equal to thethreshold time T₁ and less than the threshold time T₂, it is required todischarge more ink by a smaller FLS shot number than in the flushingprocess when the elapsed time T is less than the threshold time T₁.

However, this difference can be absorbed by setting the FLS voltage 2 Vhigher. First, the ink amount per one shot is substantially the samewhen ink that has thickened by approximately 1.3 (Pa·s) is discharged byan FLS voltage of 26 V and when ink prior to thickening is discharged byan FLS voltage of 24 V. Moreover, the case where viscosity of ink risesby 1.3 (Pa·s) refers to the case where a time that the recording head 39has not discharged ink (that is, the elapsed time T) is one year ormore. On the other hand, the previously mentioned threshold times T₁ andT₂ are sufficiently shorter than one year (for example, T₁=5 min, andT₂=60 min), hence variation in FLS shot number within the limit range issufficiently compensated for by increase/decrease of the FLS voltage.

Moreover, when the determined ink amount is greater than or equal to thesecond threshold value, the controller 130 may determine the number ofink droplets discharged from the first nozzle to be larger than thenumber of ink droplets discharged from the second nozzle. Furthermore,the controller 130 may set the number of ink droplets discharged fromthe first nozzle and the second nozzle such that the larger thedetermined ink amount is, the larger a difference between the number ofink droplets discharged from the first nozzle and the number of inkdroplets discharged from the second nozzle is set. On the other hand,when the determined ink amount is less than the second threshold value,the controller 130 may determine the number of ink droplets dischargedfrom the first nozzle and the number of ink droplets discharged from thesecond nozzle to be identical.

In more detail, the controller 130, in step S39, may determine the FLSshot number of black ink and magenta ink to be 80, and may determine theFLS shot number of cyan ink and yellow ink to be 100. Moreover, thecontroller 130, in step S43, may determine the FLS shot number of blackink and magenta ink to be 400, and may determine the FLS shot number ofcyan ink and yellow ink to be 500. Furthermore, the controller 130, instep S47, may determine the FLS shot number of black ink and magenta inkto be 1200, and may determine the FLS shot number of cyan ink and yellowink to be 1500.

Moreover, the controller 130 determines the CR speed to be 21 ips whenthe determined ink amount is less than the third threshold value, anddetermines the CR speed to be 4 ips when the determined ink amount isgreater than or equal to the third threshold value. 21 ips is an exampleof a first speed, and 4 ips is an example of a second speed which isslower than the first speed. Furthermore, the controller 130 determinesthe FLS number-of-times to be one when the determined ink amount is lessthan the fourth threshold value, and determines the FLS number-of-timesto be three when the determined ink amount is greater than or equal tothe fourth threshold value. FLS number-of-times=1 is an example of atimes, and FLS number-of-times=3 is an example of β times which is morenumerous than a times.

Returning to FIG. 7, the controller 130 executes a first preparationprocess (S13). That is, the preceding command may be expressed in otherwords as a command that instructs execution of the first preparationprocess. The first preparation process is a process for putting theprinter 11 in a state enabling execution of the recording process. A“state enabling execution of the recording process” may be described inother words as a state enabling an image of not less than a certainquality to be recorded. As shown in FIG. 9, for example, the firstpreparation process includes a raising process (S51), an uncappingprocess (S52), a second moving process (S53), and a jiggling process(S54, S55).

The raising process (S51) is a process in which the power supply section110 boosts a drive voltage supplied to each of configuring elements ofthe printer 11, to an FLS voltage V_(F) determined in the FLS conditiondetermining process. The power supply section 110, for example, boosts apower supply voltage supplied from an external power supply, to the FLSvoltage V_(F), by an unillustrated regulator circuit. Raising the powersupply section 110 refers to, for example, storing a charge in anunillustrated storage element such as a condenser. Furthermore, after acharge corresponding to the FLS voltage V_(F) has been stored in thestorage element, the regulator circuit continues to apply the storageelement with a voltage for maintaining the drive voltage.

However, when the drive voltage is suddenly raised, there is apossibility that the drive voltage during raising becomes unstable.Accordingly, the controller 130 boosts the drive voltage to a checkvoltage V₁ by, for example, feedback control. Next, the controller 130,based on the drive voltage having reached the check voltage V₁, booststhe drive voltage to a check voltage V₂ by feedback control. In thisway, raising is performed gradually by repeating a plurality of raisingsteps. That is, V₁<V₂< . . . <V_(F). As a result, fluctuation of thedrive voltage during raising is suppressed.

Note that the check voltages V₁, V₂, . . . are set such that the closerthey come to the FLS voltage V_(F), the more finely they are set. As anexample, when the FLS voltage V_(F)=24 V, the check voltages are set to20 V, 22 V, 23 V, 23.5 V, 23.75 V. As another example, when the FLSvoltage V_(F)=26 V, the check voltages are set to 20 V, 24 V, 25 V, 25.5V, 25.75 V. Moreover, since a majority of processing time of the raisingprocess is occupied by feedback control after the drive voltage has comeclose to the FLS voltage V_(F), no great difference occurs in executiontime of the raising process, whichever of 24V, 26 V the FLS voltageV_(F) is.

In addition, the controller 130 may execute the raising process in astate where the drive voltage has been applied to the recording head 39by the power supply section 110. A “state where the drive voltage hasbeen applied to the recording head 39” refers to a state where, forexample, the drive voltage during raising is applied to the vibratingelement of the recording head 39 by setting to a conductive state aswitch element of a circuit from the power supply section 110 to therecording head 39. In other words, it may also be expressed as a statewhere ink droplets are discharged from the nozzle 40 when the drivevoltage during raising has reached 24 V. As a result, fluctuation of thedrive voltage during raising can be further suppressed for the followingreason.

First, generally, when a voltage applied to a circuit fluctuates, a risetime and a fall time of a voltage waveform become longer the larger aresistance component in said circuit is. That is, the larger theresistance component is, the smaller a change in voltage per unit timebecomes. Moreover, in the circuit from the power supply section 110 tothe vibrating element of the recording head 39, there exist resistancecomponents of a transistor configuring the switch element, an outputsection outputting a drive signal, and so on. Accordingly, if from thepower supply section 110 to the recording head 39 is configured as onecircuit, then fluctuation of the drive voltage during raising can bemore attenuated compared to when a break is made between the powersupply section 110 and the recording head 39 to configure a single bodycircuit of the power supply section 110.

Moreover, a control circuit of the recording head 39 having thevibrating element can be regarded as a condenser having a certainelectrostatic capacity. Moreover, this condenser repeats charging anddischarging along with fluctuation of the applied drive voltage. As aresult, since a high frequency component of voltage fluctuation can beremoved, fluctuation of the drive voltage during raising can be furtherattenuated.

Furthermore, the raising process (S51) is typically executed at a timingwhen power supply of the multifunction peripheral 10 has been activated,or a timing when the power supply section 110 has been switched from thesleep state to the drive state. That is, when the drive voltage suppliedby the power supply section 110 has already reached the FLS voltageV_(F), the raising process (S51) is sometimes omitted.

The uncapping process (S52) is a process in which the cap 71 is movedfrom the covering position to the separated position. That is, thecontroller 130 rotates the feed motor 101 to an extent of apredetermined rotation amount. Then, the rotational drive force of thefeed motor 101 is transmitted to the raising-and-lowering mechanism viathe switching mechanism 170 in the third state, whereby the cap 71 ismoved from the covering position to the separated position. Moreover,the detection signal outputted from the cap sensor 123 changes from thehigh level signal to the low level signal before the cap 71 reaches theseparated position, in other words, during execution of the uncappingprocess.

The second moving process (S53) includes a process in which theswitching mechanism 170 is switched from the third state to the firststate, and a process in which the carriage 23 that has been separatedfrom the cap 71 is moved from the second position toward the firstposition. That is, the controller 130 moves the carriage 23 in thesecond position in the rightward orientation, and then moves it in theleftward orientation toward the first position. The controller 130, instep S53, causes the carriage 23 to reach a position leftward of the inkreceiver 75, as shown in FIG. 10A. Moreover, in order to suppress ameniscus of the ink formed in the nozzle 40 of the recording head 39being destroyed, the controller 130 may execute the process of step S53after moving the carriage 23 at low speed in the leftward orientation ata start time point of step S53.

The jiggling process (S54, S55) is a process in which at least one ofthe feed motor 101 and the conveyance motor 102 is forward/reverserotated. In more detail, the controller 130 forward/reverse rotates bothof the feed motor 101 and the conveyance motor 102 when the switchingmechanism 170 is in the third state (S54). As a result, surface pressurebetween the drive gear 172 and the driven gear 176 and surface pressurebetween the drive gear 173 and the driven gear 177 are released, hencemeshing of each of the gears is smoothly released. In addition, thecontroller 130 forward/reverse rotates the feed motor 101 when theswitching mechanism 170 is switched to the first state (S55). As aresult, the drive gear 172 and the driven gear 174 can be smoothlymeshed. Note that the jiggling process may be only one of steps S54,S55.

Note that as shown in FIG. 9, the controller 130 begins the processes ofsteps S51, S52 simultaneously, at a timing of having received thepreceding command. That is, the controller 130 executes the processes ofsteps S51, S52 in parallel. In addition, the controller 130 begins stepsS53, S54 simultaneously. That is, the controller 130 executes theprocesses of steps S53 to S55 in parallel. However, execution timings ofeach of steps S51 to S55 are not limited to the example of FIG. 9.

Furthermore, the controller 130 begins the process of step S53 at atiming when the detection signal of the cap sensor 123 has changed fromthe high level signal to the low level signal. That is, the controller130 begins step S53 later than a start of steps S51, S52. In moredetail, the controller 130 executes the process to move the carriage 23at low speed in the leftward orientation and the process to move thecarriage 23 rightwards of the second position, of step S53, in parallelwith step S52. On the other hand, the controller 130 executes theprocess to move the carriage 23 in the leftward orientation toward thefirst position, of step S53, after finish of step S52.

Typically, the raising process has the longest execution time among theplurality of processes (S51 to S55) included in the first preparationprocess. Accordingly, as shown in FIG. 9, the controller 130 executesthe process of step S51 and each of the processes of steps S52 to S55 inparallel. In other words, the controller 130 executes each of theprocesses of steps S52 to S55 at certain timings during execution of theprocess of step S51. Further rephrasing this, each of the processes ofsteps S52 to S55 are executed in parallel with the process of step S51.

Next, returning to FIG. 7, the controller 130, based on having receivedthe recording command from the information processing apparatus 51 viathe communication part 50 (S11: Recording Command), judges whether thefirst preparation process has finished or not (S14). That is, areceiving timing of the recording command is sometimes before finish ofthe first preparation process as shown in FIG. 9, and is sometimes afterfinish of the first preparation process. The controller 130, based onhaving judged that the first preparation process has not yet finished(S14: No), holds execution of subsequent processes until the firstpreparation process finishes.

Then, the controller 130, based on having judged that the firstpreparation process has finished (S14: Yes), executes a secondpreparation process (S15). The second preparation process is a processnot included in the first preparation process, of the process forputting the printer 11 in a state enabling execution of the recordingprocess. As shown in FIG. 9, for example, the second preparation processincludes the flushing process (S61), a first moving process (S62), astep-down process (S63), a feed process (S64), and a positioning process(S65).

The flushing process (S61) is a process in which the recording head 39is caused to discharge ink droplets toward the ink receiver 75, based onthe execution conditions determined in the FLS condition determiningprocess. That is, the controller 130, in step S61, in the process ofmoving the carriage 23 at the CR speed, applies the vibrating elementwith the FLS voltage V_(F) to execute, to an extent of the FLSnumber-of-times, the flushing process causing the recording head 39 todischarge the FLS shot number of ink droplets.

First, the controller 130, as a first time flushing process, moves thecarriage 23 rightwards from the position shown in FIG. 10A, and causesink droplets to be discharged from each of the nozzles 40 at a timingpredetermined for each of the nozzles 40. Note that the carriage 23accelerates to the CR speed from a standstill state and moves atconstant speed at the CR speed, during a period of the flushing process.That is, the CR speed determined in the FLS condition determiningprocess refers to a maximum speed or target speed of the carriage 23 inthe flushing process.

A discharge timing of ink droplets is predetermined such that inkdroplets impact on target positions on the guide plates 75B, 75C.Discharge timing of each of the nozzles 40 is specified by the pulsesignal outputted from the carriage sensor 38, for example. In thepresent embodiment, as shown by the broken lines in FIG. 10B, forexample, ink droplets are discharged at an initial timing from the rightend nozzle column discharging black ink and the right end nozzle columndischarging cyan ink, and ink droplets are discharged at a next timingfrom the nozzle column adjacent on the left to the nozzle column fromwhich ink droplets have been discharged. That is, the controller 130causes ink droplets to be discharged in sequence in the scanningdirection (that is, in order from right to left) from each of thenozzles 40.

Moreover, when FLS number-of-times=1, in a single time flushing process,the FLS shot number of ink droplets are discharged from each of thenozzles 40. On the other hand, when FLS number-of-times=3, in a singletime flushing process, ⅓ of the FLS shot number of ink droplets aredischarged from each of the nozzles 40. In more detail, the controller130, in a single time flushing process, causes each of the nozzles 40 todischarge (FLS shot number/FLS number-of-times) of ink droplets. Thatis, the controller 130, when executing a plurality of times of flushingprocesses in step S61, causes each of the nozzles 40 to discharge theFLS shot number of ink droplets dispersed in the plurality of flushingprocesses.

Next, when FLS number-of-times=3, the controller 130, after havingcaused ink droplets to be discharged from all of the nozzles 40 in thefirst time flushing process, stops the carriage 23 at the position shownin FIG. 10C. Then, the controller 130, as a second time flushingprocess, moves the carriage 23 leftwards from the position shown in FIG.10C, and causes ink droplets to be discharged from each of the nozzles40 at a timing predetermined for each of the nozzles 40. That is, in thesecond time flushing process, a movement orientation of the carriage 23(leftward orientation) and an order of causing each of the nozzles 40 todischarge ink droplets (that is, an order from left to right) aredifferent from in the first time flushing process.

Furthermore, the controller 130, based on the second time flushingprocess having finished, executes a similar process to the first timeflushing process, as a third time flushing process. That is, regardlessof the FLS number-of-times determined in the FLS condition determiningprocess, the controller 130, in a final flushing process, moves thecarriage 23 in an orientation approaching the sheet facing area (thatis, the rightward orientation).

Note that the controller 130 may further execute a non-dischargeflushing process before the first time flushing process. Thenon-discharge flushing process is a process in which the vibratingelement is vibrated to a degree insufficient for ink droplets to bedischarged from the nozzle 40. The non-discharge flushing process may beexecuted at any timing after finishing the raising process. That is, thenon-discharge flushing process may be started before the recordingcommand is received. Moreover, execution time of the non-dischargeflushing process may be set such that, for example, the longer theelapsed time T is, the longer the execution time is set. As a result, inthe flushing process, ink droplets become more easily discharged fromthe nozzle 40.

The first moving process (S62) is a process in which the carriage 23 ismoved to a detection position. The detection position is a position thatthe sheet 12 of all sizes (for example, A4, B4, L-type, and so on)supportable by the feed trays 20A, 20B passes, of the sheet facing area.When the sheet 12 is supported by the feed trays 20A, 20B in a statewhere a center of the sheet 12 in the scanning direction has beenpositioned, the detection position may be a center of the sheet facingarea in the scanning direction.

In the first time flushing process when FLS number-of-times=1 or in thethird time flushing process when FLS number-of-times=3, the controller130, based on ink droplets having been discharged from all of thenozzles 40, causes the carriage 23 which is in motion to reach thedetection position without stopping the carriage 23. As an example, thecontroller 130, in the case of having executed the flushing process atCR speed=21 ips, executes the first moving process without changing thespeed of the carriage 23. As another example, the controller 130, in thecase of having executed the flushing process at CR speed=4 ips, executesthe first moving process accelerating the carriage 23 to 14 ips.However, the controller 130 may move the carriage 23 to the detectionposition at CR speed=21 ips or CR speed=4 ips.

The step-down process (S63) is a process in which step-down from the FLSvoltage determined in the FLS condition determining process to theminimum voltage, is performed. That is, the controller 130, in the caseof having raised the drive voltage from the minimum voltage to a highvoltage in step S51, executes the step-down process. On the other hand,the controller 130, in the case of having raised the drive voltage tothe minimum voltage in step S51, skips execution of the step-downprocess. The controller 130 causes the regulator circuit to stopapplication of the voltage to the storage element. As a result, thecharge that has been stored in the storage element self-discharges.Then, the controller 130, based on the charge that has been stored inthe storage element having attained the minimum voltage, causes theregulator circuit to continuously apply to the storage element a voltagefor maintaining the drive voltage at the minimum voltage.

The feed process (S64) is a process in which the sheet 12 supported bythe feed tray 20A is fed by the feed section 15A to a position where thesheet 12 reaches the conveyance roller section 54. This feed process isexecuted in the case that the recording command indicates the feed tray20A as a feed source of the sheet 12. The controller 130 forwardlyrotates the feed motor 101, and after the detection signal of the resistsensor 120 changes from the low level signal to the high level signal,further forwardly rotates the feed motor 101 to an extent of apredetermined rotation amount. Then, by the rotational drive force ofthe feed motor 101 being transmitted to the feed roller 25A via theswitching mechanism 170 in the first state, the sheet supported by thefeed tray 20A is fed to the conveyance path 65.

The positioning process (S65) is a process in which the sheet 12 thathas been brought to the conveyance roller section 54 by the feed processis conveyed in the conveyance direction 16 by the conveyor to a positionwhere an area on which an image will first be recorded (hereafter,sometimes described as “recording area”) can face the recording head 39.An initial recording area on the sheet 12 is indicated in the recordingcommand. The controller 130, by forwardly rotating the conveyance motor102, detects a leading edge of the sheet 12 by the media sensor 122, andfurther causes the sheet 12 that has been brought to the conveyanceroller section 54 to be conveyed by the conveyor until the initialrecording area indicated in the recording command faces the recordinghead 39.

Note that each of the processes (S61 to S65) included in the secondpreparation process cannot be started until after at least some of theplurality of processes included in the first preparation process havefinished. The flushing process cannot be started until after the raisingprocess, the uncapping process, and the second moving process havefinished, but can be started even if the jiggling process has notfinished. On the other hand, the feed process cannot be started untilafter the jiggling process has finished, but can be started even if theraising process and the second moving process have not finished.Moreover, the first moving process cannot be started until after theflushing process has finished. Furthermore, the positioning processcannot be started until after the feed process and the first movingprocess have finished.

That is, the controller 130, based on having received the recordingcommand and on the raising process, the uncapping process, and thesecond moving process having finished (S11: Recording Command & S14:Yes), begins the flushing process. Then, the controller 130, based onthe flushing process having finished, begins the first moving processand the step-down process. That is, the controller 130 executes thefirst moving process and the step-down process in parallel. Moreover,the controller 130, based on having received the recording command andon the jiggling process having finished (S11: Recording Command & S14:Yes), begins the feed process. Then, the controller 130, based on thefeed process and the first moving process having finished, begins thepositioning process.

Moreover, although illustration of this is omitted, in the case that therecording command indicates the feed tray 20B as a feed source of thesheet 12, the controller 130 switches the switching mechanism 170 fromthe first state to the second state, based on the flushing processhaving finished. That is, the controller 130 moves the carriage 23 whichis in motion in the flushing process further in the rightwardorientation, whereby the lever 178 locked in the first locking sectionis locked in the second locking section. Then, the controller 130, basedon having switched the switching mechanism 170 to the second state,moves the carriage 23 to the detection position. Furthermore, thecontroller 130, based on having switched the switching mechanism 170 tothe second state, begins the feed process to feed the sheet 12 supportedby the feed tray 20B.

Returning again to FIG. 7, the controller 130, based on all of theprocesses included in the second preparation process having finished,executes the recording process in accordance with the received recordingcommand (S16 to S19). The recording process includes, for example, adischarging process (S16) and a conveyance process (S18) that arealternately executed, and a discharge process (S19). The dischargingprocess (S16) is a process in which the recording head 39 is caused todischarge ink droplets onto the recording area of the sheet 12 faced bythe recording head 39. The conveyance process (S18) is a process inwhich the conveyor is caused to convey the sheet 12 to an extent of acertain conveyance width along the conveyance direction 16. Thedischarge process (S19) is a process in which the discharge rollersection 55 is caused to discharge to the discharge tray 21 the sheet 12recorded with the image.

That is, the controller 130 moves the carriage 23 from one end to theother end of the sheet facing area and causes the recording head 39 todischarge ink droplets at a timing indicated by the recording command(S16). Next, the controller 130, based on existence of an image thatshould be recorded on the next recording area (S17: No), causes theconveyor to convey the sheet 12 to a position where the next recordingarea is faced by the recording head 39 (S18). The controller 130repeatedly executes the processes of steps S16 to S18 until an image isrecorded on all of the recording areas (S17: No). The controller 130,based on an image having been recorded on all of the recording areas(S17: Yes), causes the discharge roller section 55 to discharge thesheet 12 to the discharge tray 21 (S19).

Moreover, although illustration of this is omitted, the controller 130,based on a certain time having elapsed after the recording process (S16to S19) has finished, moves the carriage 23 to the second position,changes the switching mechanism 170 to the third state, and moves thecap 71 to the covering position. Furthermore, the controller 130, basedon a certain time having elapsed after moving the cap 71 to the coveringposition, switches the power supply section 110 from the drive state tothe sleep state, and executes a so-called discharge flushing process.The discharge flushing process is a process in which the regulatorcircuit is caused to stop application of the voltage to the storageelement, and the drive voltage is applied to vibrate the vibratingelement. As a result, the charge that has been stored in the storageelement is instantaneously discharged. Moreover, even if ink has beendischarged from the nozzle 40 due to vibration of the vibrating element,said ink impacts on the inside of the cap 71, hence contamination of thesheet facing area can be suppressed.

[Technical Effects of Present Embodiment]

The higher the drive voltage is, the larger the amount of inkdischargeable from the nozzle 40 per unit time becomes. Accordingly, asin the above-described configuration, when the ink amount that should bedischarged is greater than or equal to the first threshold value, theFLS voltage is made higher than when the ink amount that should bedischarged is less than the first threshold value. Now, a smaller effectis exerted on execution time of the preparation process (S13, S15) byincrease/decrease of the FLS voltage compared to by increase/decrease ofthe FLS shot number, the CR speed, and the FLS number-of-times.Accordingly, first, the FLS voltage, of the plurality of parameters thatare execution conditions of the flushing process, isincreased/decreased, whereby ink required to maintain image recordingquality can be discharged while suppressing increase in length ofexecution time of the flushing process.

On the other hand, the drive voltage has its upper limit value fixed,hence when the ink amount that should be discharged is greater than orequal to the second threshold value, the number of ink dropletsdischarged is made larger than when the ink amount that should bedischarged is less than the second threshold value. Moreover, themovement speed of the carriage in an area facing the ink receiver ismade faster when the ink amount that should be discharged is less thanthe third threshold value, than when the ink amount that should bedischarged is greater than or equal to the third threshold value.Furthermore, the number-of-times of moving the carriage in the areafacing the ink receiver is made fewer when the ink amount that should bedischarged is less than the fourth threshold value, than when the inkamount that should be discharged is greater than or equal to the fourththreshold value. As a result, even when the ink amount that should bedischarged in the flushing process is large, ink required to maintainimage recording quality can be reliably discharged.

Moreover, change in viscosity with drying differs according tocomposition of the ink, and so on. Therefore, there is a tendency thatwhen ink droplets are discharged from each of the nozzles 40 by anidentical drive voltage, the higher the viscosity of the ink is, thesmaller the ink amount per one droplet becomes. Accordingly, as in theabove-described configuration, by making different the FLS shot numbersin the first nozzle and the second nozzle, a discharge amount ofrelatively high viscosity ink can be secured, and discharge of more thannecessary of relatively low viscosity ink can be suppressed. However, amethod of adjusting the discharge amount from the first nozzle and thesecond nozzle is not limited to the FLS shot number, and may be the FLSvoltage. That is, when the determined ink amount is greater than orequal to the first threshold value, the controller 130 may make the FLSvoltage of the first nozzle higher than the FLS voltage of the secondnozzle.

Note that the FLS voltage when the determined ink amount is less thanthe first threshold value may be fixed at the minimum voltage, or may beincreased/decreased according to the ink amount. In addition, the FLSshot number when the determined ink amount is less than the secondthreshold value may be fixed at 50, or may be increased/decreasedaccording to the ink amount within the previously mentioned limit range.As a result, when the ink amount that should be discharged is small,lengthening of execution time of the flushing process can be suppressedand discharge of more than necessary of the ink is suppressed.

Moreover, a combination of FLS numbers-of-times is not limited to α=1,β=3, and may be, for example, α=2, β=4. The first time flushing processin this case may be executed on the carriage 23 which is in motionleftwards in the second moving process. That is, the controller 130 mayfinish the raising process and the non-discharge flushing process duringexecution of the second moving process and execute the first timeflushing process at a timing when the carriage 23 has reached a certainposition. Furthermore, in the flushing process when α≥2, the controller130 should cause the recording head 39 to dispersedly discharge ink ofthe ink amount determined in the FLS condition determining process.

Moreover, when raising the power supply section 110 in a state where thedrive voltage has been applied to the recording head 39, fluctuation ofthe drive voltage during raising is suppressed. As a result, even if thenumber of raising steps is reduced, it can be suppressed that the drivevoltage exceeds the FLS voltage V_(F). As a result, since execution timeof the raising process is reduced, execution time of the firstpreparation process overall is reduced. Furthermore, since there is alowering of possibility of the drive voltage exceeding the FLS voltageV_(F) whereby ink is discharged from the recording head 39, mistakendischarge of ink in the sheet facing area is suppressed, even if theraising process and the second moving process are executed in parallel.Note that as another example of the raising process, the controller 130may execute the raising process setting to a cut-off state the switchelement of the circuit from the power supply section 110 to therecording head 39.

Moreover, in the step-down process according to the above-describedembodiment, the drive voltage is stepped down by self-discharge of thestorage element, hence even if the step-down process and the firstmoving process are executed in parallel, it can be suppressed that inkis mistakenly discharged onto the sheet facing area. Note that aspecific example of the step-down process is not limited to thepreviously mentioned example, and the drive voltage may be stepped downby discharge flushing process, as when the power supply section 110 isswitched from the drive state to the sleep state.

Moreover, due to the above-described embodiment, the drive voltage israised during movement of the cap 71 and the carriage 23, henceexecution time of the first preparation process is reduced more comparedto when the uncapping process, the second moving process, and theraising process are executed in turn. By executing the uncappingprocess, the second moving process, and the raising process included inthe first preparation process at appropriate timings in this way, FPOTcan be further reduced.

Moreover, due to the above-described embodiment, the first preparationprocess is executed adopting the preceding command as a trigger, henceFPOT can be reduced more compared to when the first preparation processis executed after receiving the recording command. Moreover, in thefirst preparation process, the uncapping process, the second movingprocess, and the jiggling process are executed in parallel with theraising process, whereby execution time of the first preparation processcan be reduced more compared to when each of the processes is executedin turn.

On the other hand, due to the above-described embodiment, the flushingprocess is executed after the recording command has been received, hencethe standby time from the flushing process finishing to the recordingprocess being started can be shortened. That is, deterioration of imagerecording quality due to ink in the nozzle drying, can be suppressed. Byexecuting the first preparation process and the second preparationprocess at appropriate timings in this way, FPOT can be reduced anddeterioration of image recording quality can be suppressed.

Moreover, the above-described embodiment has described an example whereink droplets are discharged by the recording head 39 in the process ofthe carriage 23 moving in the scanning direction. However, the recordinghead of the present teaching is not limited to this, and may be, forexample, a so-called line head in which nozzles are arranged in anentire area of the sheet facing area.

What is claimed is:
 1. An ink-jet printer, comprising: a conveyorconfigured to convey a sheet in a conveyance direction; a recording headconfigured to discharge ink droplets from a nozzle, in a sheet facingarea facing the sheet conveyed by the conveyor; a power supplyconfigured to supply a drive voltage to the recording head; an inkreceiver; a command receiver; and a controller configured to control theconveyor, the recording head and the power supply to execute:determining an ink amount to be discharged toward the ink receiver;determining a voltage value of the drive voltage and the number of inkdroplets to discharge the determined ink amount to the ink receiver;raising the drive voltage of the power supply to the determined voltagevalue; performing a flushing process in which the determined number ofink droplets are discharged toward the ink receiver, under a conditionthat the command receiver receives a recording command which is aninstruction to record an image on the sheet and that raising of thedrive voltage has finished; performing a printing process, under acondition that the flushing process has finished; under a condition thatthe determined ink amount is not less than a first threshold value,determining the voltage value of the drive voltage such that the drivevoltage becomes higher than the voltage value of the drive voltagedetermined when the determined ink amount is less than the firstthreshold value, and under a condition that the determined ink amount isnot less than a second threshold value which is larger than the firstthreshold value, determining the number of ink droplets such that thenumber of ink droplets becomes larger than the number of ink dropletsdetermined when the determined ink amount is less than the secondthreshold value.
 2. The ink-jet printer according to claim 1, whereinthe nozzle includes: a first nozzle configured to discharge ink dropletsof a first color; and a second nozzle configured to discharge inkdroplets of a second color of which change in viscosity with drying issmaller than those of the first color, and under a condition that thedetermined ink amount is not less than the second threshold value, thecontroller, determines the number of ink droplets discharged from thefirst nozzle to be larger than the number of ink droplets dischargedfrom the second nozzle.
 3. The ink-jet printer according to claim 1,wherein the controller determines the ink amount such that the longer anelapsed time from ink droplets being most recently discharged from thenozzle is, the larger the ink amount is determined to be.
 4. The ink-jetprinter according to claim 1, wherein the controller determines the inkamount such that the lower a temperature of a periphery of the recordinghead is, the larger the ink amount is determined to be.
 5. The ink-jetprinter according to claim 1, wherein the controller determines the inkamount such that the lower a humidity of a periphery of the recordinghead is, the larger the ink amount is determined to be.
 6. The ink-jetprinter according to claim 1, wherein under a condition that thedetermined ink amount is less than the second threshold value, thecontroller determines the number of ink droplets in a certain limitrange, and under a condition that the determined ink amount is not lessthan the second threshold value, the controller determines the number ofink droplets such that the number of ink droplets exceeds the limitrange and the controller further determines the number of ink dropletssuch that the larger the determined ink amount is, the larger the numberof ink droplets is determined to be.
 7. The ink-jet printer according toclaim 1, wherein under a condition that the determined ink amount isless than the first threshold value, the controller determines the drivevoltage such that the larger the determined ink amount is, the higherthe drive voltage is determined to be, within a range of a minimumvoltage and a maximum voltage, and under a condition that the determinedink amount is not less than the first threshold value, the controllerdetermines the drive voltage to be the maximum voltage.
 8. The ink-jetprinter according to claim 1, wherein under a condition that the drivevoltage has raised to a voltage which is higher than the minimum voltageand that the flushing process has finished, the controller controls thepower supply to lower the drive voltage to the minimum voltage, andunder a condition that the flushing process has finished and that thedrive voltage becomes the minimum voltage, the controller controls theconveyor and the recording head to perform the printing process.
 9. Theink-jet printer according to claim 8, wherein the power supply includesa charger charging electric charges corresponding to the drive voltage,and upon lowering the drive voltage, the controller controls the powersupply to stop application of a voltage to the charger and causes thecharger to self-discharge until the drive voltage reaches the minimumvoltage.
 10. The ink-jet printer according to claim 8, furthercomprising: a carriage being movable in a scanning direction in thesheet facing area, the scanning direction intersecting the conveyancedirection; and a sensor mounted in the carriage to detect that the sheetconveyed by the conveyor has reached the sheet facing area, wherein therecording head is mounted on the carriage and has a plurality of thenozzles arranged in the scanning direction, the ink receiver faces therecording head in a case that the carriage is positioned in a firstposition displaced in the scanning direction from the sheet facing area,and the controller controls the conveyor, the recording head, the powersupply and the carriage to execute: in the flushing process, dischargingthe determined number of ink droplets from each of the plurality of thenozzles in an arrangement order in the scanning direction, while movingthe carriage in an area including the first position; and performing afirst moving process which causes the carriage which is in motion toreach the sheet facing area without stopping the carriage, in parallelwith lowering the drive voltage, under a condition that ink droplets hasbeen discharged from all of the nozzles in the flushing process,executes: conveying the sheet toward the sheet facing area; andperforming the printing process, under a condition that lowering thedrive voltage has finished and that the sensor detects the conveyedsheet.
 11. The ink-jet printer according to claim 10, wherein thecontroller controls the recording head and the carriage to execute:moving the carriage at a first speed in the flushing process, in a casethat the determined ink amount is less than a third threshold valuewhich is larger than the second threshold value; and moving the carriageat a second speed which is slower than the first speed in the flushingprocess, in a case that the determined ink amount is not less than thethird threshold value.
 12. The ink-jet printer according to claim 10,wherein the controller controls the recording head to execute:discharging the determined number of ink droplets in a times of theflushing processes, under a condition that the determined ink amount isless than a fourth threshold value which is larger than the thirdthreshold value; and discharging the determined number of ink dropletsdispersed in β (β>α) times of the flushing processes, under a conditionthat the determined ink amount is not less than the fourth thresholdvalue.
 13. The ink-jet printer according to claim 10, wherein thecontroller determines the ink amount, under a condition that the commandreceiver receives a preceding command giving prior notice oftransmission of the recording command.
 14. The ink-jet printer accordingto claim 13, further comprising: a cap facing the recording head in acase that the carriage is positioned in a second position which is aposition displaced in the scanning direction from the sheet facing area, the second position being different from the first position; and a capshifter configured to move the cap relative to the recording head,between a covering position where the cap closely contacts the recordinghead to cover the nozzle and a separated position where the cap isseparated from the recording head, wherein under a condition that thecommand receiver receives the preceding command, in parallel withraising the drive voltage, the controller controls the power supply, thecap shifter and the carriage to execute: taking the cap off therecording head by changing a relative position of the recording head andthe cap from the covering position to the separated position; andperforming a second moving process in which the carriage is moved fromthe second position toward the first position, in a case that the capand the recording head has separated.
 15. The ink-jet printer accordingto claim 1, wherein the controller determines the number of ink dropletssuch that the number of ink droplets becomes the same when thedetermined ink amount is not less than the first threshold value andwhen the determined ink amount is less than the first threshold value.16. The ink-jet printer according to claim 1, wherein the controllerdetermines the voltage value of the drive voltage such that the drivevoltage becomes the same when the determined ink amount is not less thanthe second threshold value and when the determined ink amount is lessthan the second threshold value.